Power-operated scissors



' Dec. 8,1925- WVL. HOFFMAN POWER OPERATED SCISSGRS Filed April 1. 1925" v xxmwygg num IIIIW Patented pa; s, 1925;

To all whom it may concern:

- umrso -sures PATENT) orrlcs.

f WILLIAM L. HOFFMAN; or nnsr'on, rnmzsynvmm;

rownn-ornnannn scrssons.

I Beit known that I, WILLIAM L. Horn MAN, a citizen of the United, States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented certain new and useful Improyements in Power-Operated Scissors, of wh ch the fol I use, no serious attempt has been made to market motorized shears. or 'soissorsfor the reason that such as were proposed did not have the essentialor esirahle relative vibraa tory movementuot t e blades" as obtained with manually operated implements.

The object of'myinventi'on is-to provide for such essential or desirable movement,

and, at all events, to provide an implement of the nature indicated that shall be comparatively simple in construction, inexpensiveand highly eiiicient when applied to any use to which ordinary hand shears or scissors are adapted.

The invention in its preferred form is illustrated in the accompanying drawing ,Wherein- Figure 1 is an elevational view with one of the handle complements removed to disclose the operating mechanism,

Figure 2 is an edge view,

' Figure 3 is a sect ion on line 3-45 of Figure 1, and

Figure 4' is a perspective view of the operating mechanism detached.

a the ot er complement really being e According to my invention a pair of cutting blades 5 of the usual SCISSOI'S type is pivoted flfor relative opening and closing movement; The pivot may be a bolt or stud 6 constituting one-of the connecting ele- 'ments of a pair of hand grasping or handle complements 7 and 8. which constitute'a case ing or housing forthe rearwardly extending arms 9 of the blades and for the instrumentalities for vibrating the same. In the present embodiment the cutting blades are actually mounted in" the complement 7 which is she ed or cored as at 10' for that purpose,

plate and also operating to provi the ad- 'npplication filed April 1, 192 5. 'Serial No. 19,872.

ditional thicknessghas at 1 1, to enable the handle to properly fit the closed palm of the operator.

A driven shaft 12 rangin transversely 4 the handle or casing is journa ed at one end i in the sidewall of the member 7 and at the other end in a partition 13 which takes a flush fit in edge recesses 14 0f said member.

The shaft 12' accommodates a vibrating element or cam block 15 mounted. between the blade arms or jaws 9 and serving to part them against theclosing effort of aretracv tile or coiled spring 16 engaging the termi- 112115 of thejaws. Shaft 12 also accommodates a worm pinion 17 through which it derives its motion. V p

A driving shaft 18 ranging longitudinally of'the handle portion is journaled in a pair of lug extensions 19 of the partition 13. It

is formed or provided with a worm 20 which meshes with the pinion 17. The other or free end of the shaft is accommodated in the sleeved portion 2l of the handle and has a split tubular externally threaded mo tion 22 for engagement with the usual exihle shaft, not shown. The handle has an externally threaded neck portion 23 to receive a thimhle or coupling which maybe an adjunct of the flexible -shaft. It has been found in practice that the constant speed transmitted to the camthrough the agency of the worm drive isthe nearest approximation to manual operation.

Having described my invention, I claim:

A motorized cutting implement comprisinga twopart casing externally shapedto fit Within the closed hand, a partition seated in one part of such casing and held in position by the other part of the casing,.piv-

otally connected blades mounted-at one end of the casing'and extending heyond the same as cutting portions and Within the same be low the partition as operating members a rotating element supported in the partition and formed to actuatethe operating memhers, and a shaft'mounted in the 11 per por tion of the casing and supported on the partition, said shaft operating said rotating element. l

In testimony whereofl aifixdmy signature. l t

WILLIAM L. HOFFMAN. r 

